@misc{indiciae141153f94e4a, title = {Vertical density matrix algorithm: a higher-dimensional numerical renormalization scheme based on the tensor product state ansatz.}, author = {N Maeshima and Y Hieida and Y Akutsu and T Nishino and K Okunishi}, year = {2001}, doi = {10.1103/physreve.64.016705}, url = {https://pubmed.ncbi.nlm.nih.gov/11461440/}, note = {Source identifier: 11461440} }